.90 x.45 x.81 in. Finally, an economy micro servo with smooth, quiet performance and good power. Unlike many of the micro servos available in this price range, these eRC servos have very good resolution. They transition from one end to the other in small precise steps and center accurately. Ideal for use in parkflyer airplanes and EDF jets. The precision that you want at a price you can love. A 9 gram metal gear micro servo is also available.

Volts

Speed

Torque

Weight

4.6V

6V

.14 sec/60&deg
.12 sec/60&deg

13.89 oz/in

15.25 oz/in

8g

Technical Specifications:

Length:

.90"

Width:

.45"

Height:

.81"

Torque 4.8 / 6V:

14 / 15 oz./in.

Speed 4.8 / 6V:

.14 / .12 sec.

Weight:

.28 oz.

Update of original review

4 of 4 people found this posting helpful

Review by Carl Payne(California USA) on Sep 18, 2013

this is a re-post of the comment I made on Apr 16, 2013; 11:21am PDT

I just thought I should post an update. After testing the malfunctioning servo for about two minutes using the servo tester in my iMeter 5-in-1 multi-tool, I became comfortable enough with it to put it in a Park Scale Models LoLo (a 3-channel trainer) that I built for my Dad. After I gave the model to my Dad it sat in his closet for a few months before we took it out and flew it. All of the servos worked perfectly. After that the model went back into the closet for a few more months before we took it out and flew it again. Again everything worked.
(All of this happened one or two months before I posted the review).

I realize that we were not putting the servo under any significant stress, but based on what I saw of the servo's internal components: a coreless motor (much better than the hobbyking servos which use cored motors), well soldered wires connecting the motor to the control circuit and that to the potentiometer; I feel comfortable saying that the servo I received was built well despite the problems that I had with it. I now think that there was just some dust in the potentiometer and that a small blast of compressed air would have fixed the problem.

Just so you know, it is possible to get two bum servos in a row, it's just not very probable. However, just because something isn't likely to happen does not mean that it can't happen. I've studied enough statistics in college to know this.

I just thought I should post an update. After testing the malfunctioning servo for [about] two minutes using the servo tester in my iMeter 5-in-1 multi-tool, I became comfortable enough with it to put it in a Park Scale Models LoLo (a 3-channel trainer) that I built for my Dad. After I gave the model to my Dad it sat in his closet for a few months before we took it out and flew it. All of the servos worked perfectly. After that the model went back into the closet for a few more months before we took it out and flew it again. Again everything worked. (All of this was done about a month before I posted the original version of this update)

I realize that we were not putting the servo under any significant stress, but based on what I saw of the servo's internal components: a coreless motor (much better than the hobbyking servos which use cored motors), well soldered wires connecting the motor to the control circuit and that to the potentiometer; I feel comfortable saying that the servo I received was built well despite the problems that I had with it. I now think that there was just some dust in the potentiometer and that a small blast of compressed air would have fixed the problem.

Awesome servo, highly recommended for small to medium foamies. I've used these as an upgrade from stock in situations where i've hopped up a park flyer (bigger motor/prop etc.) I've never had a failure or problem running these, excellent product couldn't be happier. Only complaint is sometimes availability is an issue. If they're in stock, don't wait, buy them! They go on back order fast.

I ordered two of these servos expecting them to be as well made as the five gram servos I previously ordered. One of the servos had a defective potentiometer which failed to limit the servo motor travel when it was made to swing from one end of its arc to the other. I sent it back to have it replace under warranty and the replacement servo had the same defect. Sending that one back wasn't worth the cost so I took the servo apart to see if I could figure out what was wrong with the potentiometer. As it turns out, the defect in the potentiometer is a small one and can easily be fixed. Inside the potentiometer there is a half disc formed from concentric copper rings and when it is viewed edge on there is a u-bend on its circumference. This u-bend is normally supposed to contact either the positive or negative power lead terminals in the potentiometer and in my case, the u-bend was not large enough to completely contact the negative terminal. I was able to fix it by using two jewelers screwdrivers to enlarge the u-bend so it completely contacted the terminal. As I said earlier, the servo now works perfectly; however, I'm only going to used it in an expendable plane.
The five gram servos I ordered have worked extremely well and I was very impressed by their quality. But considering the fact that HS-55 servos aren't much more expensive than these 8 gram servos, I have to say that they would be a better buy.